package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.Lombok;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段填充
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointcut() {}


    //前置通知，在通知中进行公共字段的赋值
    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("公共字段填充...........");

        //获取被拦及的方法的数据库类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value();//获得数据库类型


        //获取到被拦及的参数、实体对象
        Object[] args = joinPoint.getArgs();//约定获取第一个参数
        if (args.length == 0 && args == null) {
            return;
        }

        Object entity = args[0];


        //对公共字段进行赋值
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据不同的操作类型，为对应的属性通过反射来赋值
        if (operationType == OperationType.INSERT){
            //4个字段
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUsername = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUsername = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);


                //通过反射为对象赋值
                setCreateTime.invoke(entity,now);
                setUsername.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUsername.invoke(entity,currentId);


            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }else if (operationType == OperationType.UPDATE){
            //2个字段
            try {
            Method setUpdateTiem = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);

            Method setUpdateUsername = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);


            setUpdateTiem.invoke(entity,now);
            setUpdateUsername.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }

    }



}
